Ob qhov sib txawv tseem ceeb ntawm vector-specific thiab general-purpose inverters yog lub siab precision ntawm kev tswj thiab lub siab tso zis torque ntawm qis speeds.
Vector-specific inverter.
Vector-specific qauv ua hauj lwm ntawm lub hauv paus ntsiab lus ntawm rectification thiab ces inversion kom tau qhov zaus thiab voltage koj xav tau.
Vector tswj thev naus laus zis hloov pauv peb-theem rau hauv MT ob-theem system los ntawm kev sib koom ua ke hloov pauv, decomposing lub stator tam sim no vector ntawm AC lub cev muaj zog rau hauv ob lub DC Cheebtsam (xws li sib nqus saw hlau thiab torque tivthaiv), yog li ua tiav lub hom phiaj ntawm kev tswj cov Sib nqus saw thiab torque ntawm AC lub cev muaj zog sib cais, yog li ua tiav cov txiaj ntsig zoo tib yam li DC tswj kev ceev.
Vector tswj kuj hu ua 'ceev tswj', lus.
V / F tswj hom: Ib yam li thaum tsav tsheb nrog lub qhov rooj qhib tas li ntawm koj ko taw, qhov ceev yuav tsum hloov! Vim tias lub tsheb nyob ntawm txoj kev tsis sib xws thiab qhov kev tiv thaiv ntawm txoj kev hloov pauv, qhov nrawm nrawm thaum nce toj thiab nrawm thaum nce toj, puas yog? Nrog cov inverters, koj qhov kev teeb tsa zaus sib npaug rau qhov qhib lub qhov rooj ntawm koj ko taw thaum koj tsav tsheb, thiab qhov qhib lub qhov rooj yog tsau thaum tswj V / F.
Vector tswj hom: Nws tuaj yeem tswj lub tsheb kom tswj tau qhov nrawm thiab txhim kho kev tswj ceev kom raug raws li kev hloov pauv xws li txoj kev, tsis kam, nce toj thiab nqis.
General inverter.
Frequency converters, haum rau tag nrho cov loads, yog cov hom phiaj dav dav converters. Txawm li cas los xij, yog tias muaj hom tshwj xeeb ntawm cov zaus hloov pauv, nws raug nquahu kom siv cov hom tshwj xeeb ntawm cov zaus hloov pauv, tshwj xeeb ntawm cov zaus hloov pauv, ua kom zoo raws li cov yam ntxwv ntawm kev thauj khoom, nrog rau qhov yooj yim parameter teeb tsa, kev tswj hwm kev ua tau zoo thiab txuag hluav taws xob.
Kev xaiv kom raug ntawm zaus hloov pauv yog qhov tseem ceeb rau kev ua haujlwm ib txwm muaj ntawm kev tswj hwm. Thaum xaiv ib zaus converter, nws yog ib qho tseem ceeb kom to taub tag nrho cov yam ntxwv load ntawm lub zaus converter tsav. Hauv kev xyaum, tib neeg feem ntau faib cov tshuab tsim khoom rau hauv peb hom: lub zog torque tsis tu ncua, lub zog tsis tu ncua thiab kiv cua thiab twj tso kua mis.
Tsis tu ncua torque loads.
Lub load torque TL yog ywj siab ntawm qhov ceev n. Lub TL ib txwm nyob tas li lossis qhov tseem ceeb tas li ntawm txhua qhov ceev. Piv txwv li, kev sib txhuam loads xws li conveyors, mixers thiab extruders, nrog rau cov khoom muaj peev xwm xws li cranes thiab hoists, yog cov loads tas li.
Lub converter zaus, thaum towing ib tug load ntawm tas li torque, yuav tsum muaj ib tug txaus siab torque ntawm tsawg speeds thiab ib tug txaus overload muaj peev xwm. Yog tias yuav tsum tau ua haujlwm qis thiab ruaj khov, lub peev xwm ua kom sov ntawm cov qauv asynchronous motors yuav tsum raug coj mus rau hauv tus account kom tsis txhob muaj lub cev kub ntau dhau.
Lub zog tsis tu ncua.
Lub torque yuav tsum tau rau cov cuab yeej spindles, dov mills, ntawv tshuab, winders thiab unwinders nyob rau hauv yas zaj duab xis ntau lawm kab yog roughly inversely proportional rau qhov ceev thiab yog hu ua ib tug tas li lub hwj chim load. Cov yam ntxwv ntawm lub zog tas li ntawm qhov load yuav tsum tau qhia nyob rau hauv cov nqe lus ntawm ib tug tej yam kev ceev variations. Thaum qhov ceev qis heev, TL tsis tuaj yeem nce ntxiv mus tas li vim muaj kev txwv lub zog ntawm lub zog thiab ua rau lub zog tsis tu ncua ntawm qhov qis qis. Lub zog tsis tu ncua thiab qhov chaw torque tsis tu ncua ntawm cov khoom thauj muaj kev cuam tshuam zoo rau kev xaiv tsav kev daws teeb meem. Thaum lub cev muaj zog nyob rau hauv tas li flux ceev txoj cai, lub siab tshaj plaws tso zis torque tseem unchanged thiab belongs rau tas li torque ceev tswj; Txawm li cas los xij, nyob rau hauv kev tswj tsis muaj zog sib nqus ceev, qhov siab tshaj plaws tso zis torque yog inversely proportional rau qhov ceev thiab belongs rau lub zog ceev ceev tswj. Yog hais tias qhov tsis tu ncua torque thiab tas li lub zog ntau ntawm lub cev muaj zog yog tib yam li qhov tsis tu ncua torque thiab lub zog tas li ntawm cov khoom thauj, piv txwv li, nyob rau hauv cov ntaub ntawv ntawm "kev sib tw", lub peev xwm ntawm lub cev muaj zog thiab lub peev xwm ntawm lub inverter yog minimised.
Ntxuam thiab twj tso kua mis loads.
Nyob rau hauv ntau yam kiv cua, twj tso kua mis thiab roj twj, raws li lub impeller rotates, cov kuj ntawm cov huab cua los yog kua nyob rau hauv ib tug tej yam ceev ntau yam yog roughly proportional rau lub thib ob lub zog ntawm lub ceev n. Raws li qhov ceev txo, qhov ceev txo mus rau lub zog thib ob ntawm qhov ceev. Lub zog xav tau rau qhov kev thauj khoom no yog proportional rau peb lub zog ceev. Thaum qhov xav tau huab cua ntim thiab ntws tus nqi raug txo, lub inverter tuaj yeem kho cov cua ntim thiab ntws tus nqi los ntawm kev ceev ceev, uas tuaj yeem ua rau muaj kev txuag hluav taws xob tseem ceeb. Raws li lub zog xav tau ntawm kev kub ceev nce sai heev nrog kev ceev thiab yog proportional rau peb lub zog ntawm kev ceev, kiv cua thiab twj tso kua mis loads yuav tsum tsis txhob ntau tshaj cov khoom zaus.